Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994aas...185.4706l&link_type=abstract
American Astronomical Society, 185th AAS Meeting, #47.06; Bulletin of the American Astronomical Society, Vol. 26, p.1385
Astronomy and Astrophysics
Astronomy
Scientific paper
High resolution spectra at H(1.6 microns) and K(2.2 microns) have been obtained of the young planetary nebula Hubble 12, using the long-slit near-infrared spectrometer FSpec. The prominent features in these rich spectra include emission from the Brackett and Pfund series of hydrogen, [Fe II], He I, and H_2. Previous studies of Hubble 12 in the near-infrared have focused on ~ 10 molecular hydrogen lines at the K window which indicate flourescent emission. Our high resolution spectra (R=3500) have revealed 50 H_2 lines at both H and K. Transitions from levels as high as v=12 clearly indicate fluorescent excitation. The large number of detected H_2 lines allows us to compare in detail the observed strengths to those predicted by models of fluorescent emission. We conclude that the gas density in the outer regions of the nebula is close to n_H=3.0x10(3) cm(-3) and definitely less than the critical density, which is n_c=10(4) - 10(5) cm(-3) . We will study the emission lines from H, He I, and [Fe II] to obtain electron temperatures and densities for regions closer to the central star.
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